The conventional wisdom in Arizona's GOP Senate primary is that wealthy self-funder Wil Cardon, who's already loaned his campaign several million dollars, will outspend Rep. Jeff Flake. But based on Flake's FEC reports and the candidate's big ad buys between now and the state's Aug. 28 primary, it looks like Flake could come close to running out of money before then.

The Arizona Republican Senate primary is officially a shooting war. Conservative self-funder Wil Cardon, who has been spending heavily to introduce himself on the airwaves, is up with his first direct attack ad against GOP front-runner Rep. Jeff Flake.